2021A&A...649A..44H


Query : 2021A&A...649A..44H

2021A&A...649A..44H - Astronomy and Astrophysics, volume 649A, 44-44 (2021/5-1)

Cloud property trends in hot and ultra-hot giant gas planets (WASP-43b, WASP-103b, WASP-121b, HAT-P-7b, and WASP-18b).

HELLING C., LEWIS D., SAMRA D., CARONE L., GRAHAM V., HERBORT O., CHUBB K.L., MIN M., WATERS R., PARMENTIER V. and MAYNE N.

Abstract (from CDS):


Context. Ultra-hot Jupiters are the hottest exoplanets that have been discovered so far. Observations begin to provide insight into the composition of their extended atmospheres and their chemical day/night asymmetries. Both are strongly affected by cloud formation.
Aims. We explore trends in cloud properties for a sample of five giant gas planets: the hot gas giant WASP-43b and the four ultra-hot Jupiters (UHJs) WASP-18b, HAT-P-7b, WASP-103b, and WASP-121b. This provides a reference frame for cloud properties for the JWST targets WASP-43b and WASP-121b. We further explore chemically inert tracers to observe geometrical asymmetries of UHJs and if the location of the inner boundary of a 3D global circulation model (3D GCM) matters for the clouds that form.
Methods. A homogeneous set of 3D GCM results was used as input for a kinetic cloud formation code to evaluate the cloud opacity and gas parameters such as C/O, mean molecular weight, and degree of ionisation. We cast our results in terms of integrated quantities to enable a global comparison between the sample planets.
Results. The large day/night temperature differences of UHJs cause the following chemical asymmetries: cloud-free days but cloudy nights, atomic versus molecular gases and their different mean molecular weights, deep thermal ionospheres versus low-ionised atmospheres, and undepleted versus enhanced C/O. WASP-18b, as the heaviest planet in the sample, has the lowest global C/O.
Conclusions. The global climate may be considered as similar amongst UHJs, but different to that of hot gas giants. The local weather, however, is individual for each planet since the local thermodynamic conditions, and hence the local cloud and gas properties, differ. The morning and the evening terminator of UHJs will carry signatures of their strong chemical asymmetry such that ingress and egress asymmetries can be expected. An increased C/O ratio is a clear sign of cloud formation, making cloud modelling a necessity when utilising C/O (or other mineral ratios) as a tracer for planet formation. The changing geometrical extension of the atmosphere from the day to the nightside may be probed through chemically inert species such as helium. Ultra-hot Jupiters are likely to develop deep atmospheric ionospheres which may impact the atmosphere dynamics through magneto-hydrodynamic processes.

Abstract Copyright: © Ch. Helling et al. 2021

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: gaseous planets - astrochemistry - solid state: refractory

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 WASP-32b Pl 00 15 50.8077849942 +01 12 01.586829951           ~ 32 1
2 HD 10069 * 01 37 25.0332798696 -45 40 40.374717456   9.74 9.30     F6IV/V 190 1
3 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 310 1
4 BD+01 316b Pl 01 46 31.8576707085 +02 42 02.033178181           ~ 134 0
5 WASP-78b Pl 04 15 01.5043965171 -22 06 59.103918835           ~ 38 1
6 CD-30 1812b Pl 04 25 29.0168304676 -30 36 01.610961515           ~ 66 1
7 CPD-64 484b Pl 05 48 33.5937810570 -63 59 18.386834103           ~ 51 1
8 CD-38 3220 * 07 10 24.0604565856 -39 05 50.571250476   11.00 10.51     F6V 69 0
9 CD-38 3220b Pl 07 10 24.0606039387 -39 05 50.570553937           ~ 225 0
10 HD 86226c Pl? 09 56 29.8441755158 -24 05 57.795793912           ~ 9 0
11 HD 86226 PM* 09 56 29.8441909920 -24 05 57.799322988   8.563 7.93 7.71   G2V 67 1
12 WASP-43 PM* 10 19 38.0088913464 -09 48 22.605801336   13.4 12.4 12.08 11.10 K7V 118 1
13 WASP-43b Pl 10 19 38.0089444408 -09 48 22.603103969           ~ 296 1
14 BD-03 2978b Pl 10 42 14.0835894932 -03 50 06.259823354           ~ 64 0
15 WASP-189b Pl? 15 02 44.8679915475 -03 01 52.986005307           ~ 42 0
16 WASP-103b Pl 16 37 15.5753608801 +07 11 00.119024745           ~ 150 1
17 WASP-103 * 16 37 15.5765824488 +07 11 00.109678740     12.1     F8V 58 1
18 BD+47 2846b Pl 19 28 59.3538131541 +47 58 10.216250846           ~ 336 1
19 BD+47 2846 Er* 19 28 59.3538826128 +47 58 10.217007804   10.97 10.48     F6V 283 2
20 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 814 1
21 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1288 1
22 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 199 0
23 HD 209458 V* 22 03 10.7727465312 +18 53 03.549393384   8.21 7.63     F9V 1058 1
24 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1705 1
25 NAME LTT 9779b Pl? 23 54 40.2073323003 -37 37 40.523514220           ~ 23 0

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2022.09.24-17:58:29

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